Animal pen



FIG. 1 is an upper front perspective view of an animal pen, illustratingour ornamental design;

FIG. 2 is a lower rear perspective view thereof;

FIG. 3 is a first side view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a second side view thereof;

FIG. 6 is a rear elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines in the figures illustrate portions of the animal penthat form no part of the claimed design.

CLAIM The ornamental design for an animal pen, as shown and described.